1. Bone Fractures: The impact of the car can cause the bones in your knee, such as the tibia, fibula, and patella, to break or shatter.
2. Ligament and Tendon Injuries: The ligaments and tendons that stabilize and support your knee joint may be torn or damaged.
3. Meniscus Tears: The meniscus, which are two pieces of cartilage in your knee, may be torn or damaged due to the force of the impact.
4. Soft Tissue Damage: Muscles, nerves, blood vessels, and skin surrounding the knee can suffer significant trauma and damage.
5. Internal Bleeding: The crushing injury can cause internal bleeding within the knee joint and surrounding tissues.
6. Compartment Syndrome: If there is excessive swelling and pressure within the knee joint, compartment syndrome can develop, cutting off blood flow to the muscles and nerves in the area.
7. Infection: Open wounds and tissue damage increase the risk of infection in the knee.
8. Amputation: In extreme cases, where the damage is severe and beyond repair, amputation of the leg or knee joint may be necessary.
After sustaining such a severe injury, immediate emergency medical attention is crucial for proper assessment, treatment, and surgical interventions to repair the damaged tissues and restore knee function as much as possible. Rehabilitation and long-term care may also be required to aid in recovery.